body,
div,
h1 {
    color: #504b48;
    font-family: 'Microsoft YaHei'
}

.banner {
    height: 550px;
    min-width: 970px;
}

.banner.style1 {
    background-image: url(../img_pc/bg-product.jpg);
    text-align: center;
    background-size: auto 100%;
    background-repeat: no-repeat;
    background-position: center;
}

.banner.style1 h1 {
    font-size: 56px;
    font-family: '黑体';
    margin-top: 65px;
    margin-bottom: 32px;
    font-weight: 600;
    margin-top: 76px;
    margin-bottom: 16px;
}

.banner.style1 .txt {
    font-size: 26px;
    line-height: 1.8em
}

.banner.style1 .des {
    margin-top: 20px;
    margin-bottom: 20px;
}

.banner.style1 .des .txt {
    font-size: 16px;
    margin-top: 12px;
}

.banner .left,
.banner .right {
    float: left;
    width: 50%;
}

.banner.style2 {
    background: #f1f1f1;
}

.banner.style2 .left .txt,
.banner.style3 .right .txt {
    margin-top: 220px;
    margin-bottom: 220px;
    line-height: 2em;
    font-size: 26px;
}

.banner.style3 .right .txt {
    text-align: right;
}

.banner.style2 .left .txt {
    margin-left: 40px;
    margin-right: 15px;
}

.banner.style3 .right .txt {
    margin-left: 15px;
    margin-right: 40px;
}

.banner.style2 .right {
    height: 550px;
    position: relative;
}

.banner.style2 .right img {
    position: absolute;
    bottom: 0;
    left: 50%;
    margin-left: -150px;
}

.banner.style3 .left {
    height: 550px;
    position: relative;
}

.banner.style3 .left img {
    position: absolute;
    top: 0;
    right: 50%;
    margin-right: -150px;
}

.banner.style4 {
    background-image: url(../img_pc/bg-product-2.jpg);
    background-position: bottom;
    background-size: cover;
    text-align: center;
}

.banner.style4 h1 {
    font-size: 56px;
    font-family: '黑体';
    font-weight: 600;
    margin-top: 165px;
    margin-bottom: 32px;
}

.banner.style4 h3 {
    font-family: 'Microsoft YaHei';
    margin: 0;
}

.banner.style4 .des img {
    margin-top: 30px;
    margin-bottom: 20px;
}

.banner.style4 .des .txt {
    font-size: 16px;
}

@media (min-width: 768px) {
    .container {
        max-width: 970px
    }
}
